A manual of the higher plants of Oregon.

Plants of the Oregon coastal dunes /
by: Wiedemann, Alfred M.
Published: (1999)

Field guide to the forested plant associations of southwestern Oregon.
Published: (1996)

Plant associations of the central Oregon pumice zone /
by: Volland, Leonard A.
Published: (1985)

Flora of Steens Mountain /
by: Mansfield, Donald H.
Published: (2000)

Key to important woody plants of eastern Oregon and Washington /
by: Hayes, Doris W.
Published: (1960)

Oregon wildflowers : a children's field guide to the state's most common flowers /
by: Magley, Beverly
Published: (1992)

Plants of western Oregon, Washington & British Columbia /
by: Kozloff, Eugene N.
Published: (2005)

Natural vegetation of Oregon and Washington /
by: Franklin, Jerry F.
Published: (1988)

A field guide to ethnobotanical plants of the Winema National Forest.
by: Emanuel, Robert M.
Published: (1994)

Winter twigs : a wintertime key to deciduous trees and shrubs of northwestern Oregon and western Washington /
by: Gilkey, Helen M., 1886-1972
Published: (2001)

101 wildflowers of Crater Lake National Park /
by: Sharpe, Grant William, et al.
Published: (1959)

The mammals and life zones of Oregon /
by: Bailey, Vernon, 1864-1942
Published: (1936)

Guidelines for forage resource evaluation within central Oregon pumice zone /
by: Volland, Leonard A.
Published: (1985)

Handbook of Northwestern plants /
by: Gilkey, Helen M., 1886-1972
Published: (1975)

Handbook of Northwest flowering plants /
by: Gilkey, Helen M., 1886-1972
Published: (1951)

Handbook of northwestern plants /
by: Gilkey, Helen M., 1886-1972
Published: (2001)

Northwest plant names and symbols for ecosystem inventory and analysis /
Published: (1976)

Root diseases in Oregon and Washington conifers.
Published: (1986)

A school flora for the Pacific coast /
by: Jepson, Willis Linn, 1867-1946
Published: (1902)

Report of the exploring expedition to the Rocky Mountains in the year 1842 : and to Oregon and North California in the years 1843-44 /
by: Frémont, John Charles, 1813-1890
Published: (1845)

Co-ordinated control of higher education in Oregon /
by: Byrne, Charles David, 1895-
Published: (1940)

Plant technology tour of Northeast Oregon.
Published: (1961)

The Oregon system : the story of direct legislation in Oregon; a presentation of the methods and results of the initiative and referendum, and recall, in Oregon, with studies of the measures accepted or rejected, and special chapters on the direct primary, popular election of senators, advantages, defects and dangers of the system.
by: Eaton, Allen H. (Allen Hendershott), 1878-1962
Published: (1912)

Botanical survey of Myrtle Island Research Natural Area, Oregon /
by: Thompson, Ralph L., 1943-
Published: (2001)

Field guide to riparian plant communities in northwestern Oregon.
Published: (2005)

Rare plants of southwest Oregon /
Published: (2018)

Larval densities and trends of insect species associated with spruce budworms in buds and shoots in Oregon and Washington /
by: Carolin, V. M. (Valentine M.), 1918-
Published: (1980)

Oregon.
Published: (1999)

Ancient Oregon.
Published: (2001)

Oregon fossils /
by: Orr, Elizabeth L.
Published: (2009)

Oregon for the farmer.
Published: (1925)

The butterflies of Oregon /
by: Dornfeld, Ernst John, 1911-
Published: (1980)

Taxonomic terminology of the higher plants /
by: Featherly, H. I. (Henry Ira), 1893-1978
Published: (1965)

Forested plant associations of the Oregon East Cascades /
by: Simpson, Michael
Published: (2007)

The principal stock-poisoning plants of Oregon /
by: Lawrence, William E. (William Evans), 1883-1947
Published: (1922)

Integrated invasive plant management for the Northwest Oregon District : environmental assessment /
Published: (2018)